Mucosa-associated lymphoid tissue (MALT) lymphoma is an extra nodal marginal zone B-cell lymphoma
that has been associated with chronic infections. It affects especially stomach, but other organs of
gastrointestinal tract can be also involved. Colon MALT lymphoma is a very rare disease. We report a case
of large bowel MALT lymphoma diagnosed as a result of weight loss and positive occult fecal blood test.
Blastocystis hominis infection was detected in fecal analysis. We hypothesize chronic parasitic infection
could be related with the development of the lymphoma.
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